Stable supporting device for machining of slender shaft type workpiece with optimized middle section retaining

Abstract

A screw rod shaft (12) is connected to a bearing seat (11) and a sleeve cylinder body (2) in a penetrating mode from back to front, a lever (4) is hinged to the middle of a body shell (1) on the lower side of the sleeve cylinder body (2), and a first supporting block (5) and a second supporting block (6) are installed at the front end of the sleeve cylinder body (2) and the front end of the lever (4) respectively. The double-supporting-block supporting structure with the adjustable included angle is arranged, the supporting force can be adjusted, the grinding machining precision of the equidistant arc face slender shaft workpiece can be effectively improved, the machining rigidity, stability and efficiency can be improved, the radial cutting force borne by the slender shaft in the machining process can be offset, and therefore stress deformation of the slender shaft is eliminated; it is ensured that the dial indicator jumps within 0.005 mm before and after clamping. The device can adapt to machining of slender shafts with the high precision requirement, can be used for machining technologies such as turning, turn milling and grinding of the slender shafts with the equidistant arc surfaces, and has good universality and popularization value.

Description

Technical Field

[0001] This utility model belongs to the technical field of clamping, supporting and positioning devices for workpieces or tools in mechanical processing and precision machining, and particularly relates to a support center frame device for machining slender shaft workpieces. Background Technology

[0002] Currently, the requirements for dimensional accuracy and shape and position accuracy of slender shaft parts are becoming increasingly stringent. Due to their small average outer diameter and long length, slender shaft parts have poor rigidity during machining and are very prone to deformation, affecting machining accuracy. This poses a significant challenge to traditional grinding methods for slender shafts.

[0003] To prevent deformation during grinding, the workpiece needs to be held not only by two ejector pins at the beginning and end, but also by one or more center supports. There are two common support methods:

[0004] One method is to directly support the workpiece on the outer circle of the center rest. The disadvantages of this method are: since slender shafts are easily deformed, the roundness and cylindricity of the outer circle of the workpiece support part cannot be guaranteed by the previous machining; in addition, when the workpiece is held by two centers during grinding, the weight of the workpiece itself will also cause deformation, so it is impossible to align the support part by using a dial indicator; if the workpiece is forcibly supported by the center rest, the machining accuracy of the outer circle cannot be guaranteed.

[0005] The second method involves a center support resting on the outer diameter of a transition sleeve, which is fitted over the workpiece. Four screws at each end of the transition sleeve clamp the workpiece. The disadvantages of this method are: before support, the outer diameter of the transition sleeve is calibrated using a dial indicator and adjusted using the screws at both ends. However, the adjusting screws at both ends interfere with each other, making it difficult to ensure that the outer diameter of the transition sleeve and the outer diameter of the slender shaft support are not misaligned. Furthermore, directly adjusting the radial position with the screws at both ends makes precise control difficult. Therefore, adjustment is time-consuming, labor-intensive, and extremely difficult, resulting in very low efficiency and relatively low accuracy. Few related patent applications have been published.

[0006] Machining equidistant arc surfaces on slender shafts with large length-to-diameter ratios and low rigidity is impossible without auxiliary support. Existing auxiliary supports for turning, milling, and grinding of slender shafts are only suitable for shafts where the outer diameter center coincides with the shaft's rotation center. For slender shafts with equidistant arc surfaces where the arc center does not coincide with the shaft's rotation center, there is a lack of auxiliary support methods and devices, and even more so, a lack of auxiliary supports capable of simultaneously machining multiple equidistant arc surface slender shafts. In particular, during machining, the middle section, due to its weaker rigidity, is prone to slippage under radial cutting forces, resulting in a larger size in the middle section compared to the ends. Existing technologies, while few address this slippage in the middle section, often employing hydraulic, pneumatic, or mechanical mechanisms as the core of the device. However, these mechanisms are complex and difficult to meet the requirements of stable and simple operation. Utility Model Content

[0007] This invention proposes a mid-section anti-backward optimization stabilizing support device for machining slender shaft workpieces, providing optimized composite support in the middle part of the workpiece, aiming to solve and improve the aforementioned existing problems.

[0008] Therefore, this utility model includes: a housing, a sleeve cylinder, a lever, a first support block, a second support block, a bearing seat, a lead screw shaft, and a bearing disc; a bearing seat is installed behind the housing on which the sleeve cylinder is installed, and a bearing disc is installed in the bearing seat; the lead screw shaft passes through the bearing seat and the sleeve cylinder from back to front; and a lever is hinged in the middle of the housing on the lower side of the sleeve cylinder; a first support block and a second support block are respectively installed on the sleeve cylinder and the front end of the lever.

[0009] Among them, the middle and rear section of the cylinder body 2 has a stroke blind hole in the center axis, and the rear end of the stroke blind hole is equipped with an inner pressure ring.

[0010] Specifically, an outer pressure ring is installed on the rear end edge of the bearing housing. The protruding part of the front end face of the outer pressure ring is inserted into the rear end edge of the bearing housing and presses the bearing disc. The inner wall of the middle hole of the outer pressure ring is clamped to the partial outer wall of the rear section of the lead screw shaft. The edge of the outer pressure ring is fastened to the rear end face of the bearing housing by cylindrical end screws. A pressure cap is installed on the outer sleeve at the middle of the rear end face of the outer pressure ring, i.e., at the rear end where the lead screw shaft extends.

[0011] The cylinder body has a stroke blind hole in the middle and rear section, a transverse end groove in the middle of the front end face, and an inner guide groove with a straight structure in the axial direction on the outer wall of the cylinder body. The first support block is inserted into the transverse end groove on the front end face of the cylinder body through the straight ridge with a strip-shaped protrusion in the middle of its rear end face.

[0012] The supporting working surfaces of the first and second support blocks form an angle of less than 90°, with the opening facing the direction of the cutting force.

[0013] The lever has a ring-shaped hinge seat protruding downwards from the middle of its bottom side, a vertical screw hole at the rear end of the upper part of the lever, and a screw hole on the front wall of the front edge of the upper part of the lever.

[0014] Furthermore, to achieve the above objectives, the present invention is configured such that: the shell includes a shell base plate, a support arm, a cylinder liner, and a hinge hole; the support arm is vertically and inclined from front to center on the upper side of the shell base plate, which is flat at the bottom, and a hinge hole is provided in the middle of the support arm, and a cylinder liner is connected to the upper end of the support arm.

[0015] In particular, the cylinder liner has an axial through hole inside, and a support sealing ring is embedded in the annular groove of the inner edge of the central hole on the rear side of the front cover. The edge of the front cover is installed on the front port edge of the cylinder liner on the upper part of the body shell by fastening screws.

[0016] In particular, an axially extending external guide groove is provided on the outer wall of the cylinder liner.

[0017] In particular, a clamping block is installed at the rear end of the shell base plate at the bottom of the shell.

[0018] In particular, a threaded hole is made at the rear end of the lever, and a threaded hole is made on the bottom surface of the rear section of the cylinder liner. The lifting screw is rotated through the threaded hole at the rear end of the lever and pushes up onto the bottom surface of the rear section of the cylinder liner.

[0019] Compared with existing technologies, the beneficial effects of this utility model are as follows: The adjustable double-block support structure improves machining rigidity and allows for adjustable support force, effectively enhancing the grinding accuracy of slender shafts with equidistant arc surfaces. It improves machining rigidity, stability, and efficiency, enabling precise adjustment. The auxiliary support device is compact, reliable, and convenient. Especially in machining slender shafts using a "clamp, support, and top" clamping method, the device, positioned between the chuck and the machine tool tailstock center, counteracts the radial cutting force on the slender shaft during machining, thus eliminating deformation and ensuring the dial indicator runout is within 0.005mm before and after clamping. It can adapt to high-precision machining of slender shafts and can be used for turning, milling, and grinding of slender shafts with equidistant arc surfaces. It has excellent versatility and promotional value. Attached Figure Description

[0020] The following figures are illustrative and should not be construed as limiting the scope of this invention. Referring to the figures helps the reader understand the embodiments of this invention and further appreciate its advantages and technical features.

[0021] Figure 1 This is a schematic diagram of the main cross-sectional structure of Embodiment 1 of this utility model.

[0022] Figure 2 This is a side view of the structure of Embodiment 1 of this utility model.

[0023] Figure 3 This is a schematic diagram of the main cross-sectional structure of the shell in Embodiment 1 of this utility model.

[0024] Figure 4 This is a schematic diagram of the main structure of the cylinder block in Embodiment 1 of this utility model.

[0025] Figure 5 This is Embodiment 1 of the present utility model. Figure 4 Schematic diagram of the cross-sectional structure along the AA direction.

[0026] Figure 6 for Figure 4 Schematic diagram of the structure of the left end face of the middle sleeve cylinder block.

[0027] Figure 7 for Figure 4 Schematic diagram of the right end face of the cylinder block.

[0028] Figure 8This is a schematic diagram of the lever structure in Embodiment 1 of this utility model.

[0029] Figure 9 This is a schematic diagram of the main structure of the first support block in Embodiment 1 of this utility model.

[0030] Figure 10 This is a schematic diagram of the left-side structure of the first support block in Embodiment 1 of this utility model.

[0031] Figure 11 This is a schematic diagram of the cross-sectional structure of the shaft pin in Embodiment 1 of this utility model.

[0032] Figure 12 This is a schematic diagram of the shaft pin end face structure in Embodiment 1 of this utility model.

[0033] Figure 13 This is a schematic diagram of the right end face structure of the bearing housing in Embodiment 1 of this utility model.

[0034] Figure 14 This is a schematic diagram of the cross-sectional structure of the bearing housing in Embodiment 1 of this utility model.

[0035] Figure 15 This is a schematic diagram of the cross-sectional structure of the pressure ring in Embodiment 1 of this utility model.

[0036] Figure 16 This is a schematic diagram of the end face structure of the pressure ring in Embodiment 1 of this utility model.

[0037] Figure 17 This is a schematic diagram of the front cover end face structure in Embodiment 1 of this utility model.

[0038] The reference numerals in the figures include:

[0039] 1-Shell body, 2-Cylinder body, 3-Workpiece, 4-Lever, 5-First support block, 6-Second support block, 7-Shaft pin, 8-Clamping block, 9-Inner pressure ring, 10-Inner set screw, 11-Bearing seat, 12-Screw shaft, 13-Bearing disc, 14-Outer pressure ring, 15-Cylindrical end screw, 16-Pressure cap, 17-Front cover, 18-Support sealing ring, 19-Outer set screw, 20-Lifting screw;

[0040] 101-Shell base plate, 102-Support arm, 103-Cylinder liner, 104-Outer guide groove, 105-Reaming hole;

[0041] 201-Blind hole for travel, 202-Inner guide groove, 203-End transverse groove. Detailed Implementation

[0042] In the description of this utility model, it should also be noted that, unless otherwise expressly specified and limited;

[0043] The terms “including” and “having”, and any variations thereof, are intended to cover other possible alternatives under the same logic that are not listed.

[0044] The terms “set up,” “install,” “connect,” and “link” should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal connection between two components.

[0045] The terms “center,” “upper,” “lower,” “left,” “right,” “vertical,” “horizontal,” “inner,” and “outer,” etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings, or the orientation or positional relationships commonly used when the product is in use. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention.

[0046] The terms "first," "second," and "third," etc., are used only for distinguishing descriptions and should not be interpreted as indicating or implying relative importance. Furthermore, the terms "horizontal," "vertical," and "suspended" do not imply that the component must be absolutely horizontal or suspended, but rather that it can be slightly tilted.

[0047] Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. In case of any conflict, the definitions in this specification shall prevail.

[0048] The principle of this invention is to improve the stability of slender shaft workpieces during the machining process, especially in terms of mid-section anti-reverse optimization. The auxiliary support device should have good rigidity, stability and precision, and be able to adapt to slender shaft workpieces of different sizes and materials, so as to reduce vibration and improve machining accuracy and efficiency.

[0049] As attached Figure 1 and 2 As shown, this utility model includes: a shell 1, a cylinder body 2, a lever 4, a first support block 5, a second support block 6, a bearing seat 11, a lead screw shaft 12, and a bearing disc 13; a bearing seat 11 is installed behind the shell 1 where the cylinder body 2 is installed, and a bearing disc 13 is installed in the bearing seat 11. The lead screw shaft 12 passes through the bearing seat 11 and the cylinder body 2 from back to front. The lever 4 is hinged to the middle of the shell 1 on the lower side of the cylinder body 2. The first support block 5 and the second support block 6 are respectively installed at the front end of the cylinder body 2 and the lever 4.

[0050] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0051] Example 1: As shown in the attached document Figure 3 As shown, the shell 1 includes a shell base plate 101, a support arm 102, a cylinder liner 103, an outer guide groove 104, and a hinge hole 105. The support arm 102 is erected vertically on the upper side of the shell base plate 101, which is flat at the bottom, and is inclined upwards and to the middle. The hinge hole 105 is provided in the middle of the support arm 102. The cylinder liner 103 is connected to the upper end of the support arm 102. The cylinder liner 103 has an axial through hole inside. The central axis of the cylinder liner 103 and its axial through hole extends inclined upwards and backwards. The outer wall of the cylinder liner 103 is provided with an axially extending outer guide groove 104.

[0052] As attached Figure 4 , 5 As shown in Figures 6 and 7, the cylinder body 2 includes a stroke blind hole 201, an inner guide groove 202, and an end transverse groove 203. The stroke blind hole 201 is axially opened in the middle and rear section of the cylinder body 2, the end transverse groove 203 is transversely arranged in the middle of the front end face of the cylinder body 2, and the inner guide groove 202 with a straight structure is axially opened on the outer wall of the cylinder body.

[0053] As attached Figure 8 As shown, a ring-shaped hinge seat protrudes downward from the middle of the bottom side of lever 4, a screw hole is vertically opened at the rear end of the upper part of lever 4, and a screw hole is opened on the front wall of the front edge of the upper part of lever 4.

[0054] As attached Figure 9 , 10 As shown, the first support block 5 has a protruding and inclined front end face, a straight ridge protruding from the center of its rear end face, and four screw holes evenly distributed along its edge. The second support block 6 has a similar structure to the first support block 5.

[0055] As attached Figure 11 , 12 As shown, the inner end of the shaft pin 7 protrudes in the middle, and the outer end of the shaft pin 7 symmetrically passes through two screw holes.

[0056] As attached Figure 13 , 14 As shown, the bearing housing 11 has a cuboid shape, with a shaft hole in the center of the bearing housing 11 in the axial direction, a protrusion in the center of the front end face of the bearing housing 11, through holes in the four corners of the bearing housing 11 in the axial direction, and threaded countersunk holes in the center of the inner edge of the outer wall of the four sides of the bearing housing 11 in the axial direction.

[0057] As attached Figure 15 , 16As shown, the outer pressure ring 14 is in the shape of a circular plate with a shaft hole in the middle. The front end face of the outer pressure ring 14 protrudes in the middle, and four through holes are evenly distributed on the edge of the outer pressure ring 14. Moreover, the rear section of these through holes is enlarged.

[0058] As attached Figure 17 As shown, the front cover 17 is square plate-shaped with through holes at the four corners, and an annular groove is provided on the inner edge of the rear side of the central hole of the front cover 17.

[0059] As described above, a sleeve cylinder body 2 is coaxially mounted in the cylinder liner 103 on the upper part of the housing 1. Specifically, a support sealing ring 18 is embedded in the annular groove of the inner edge of the central hole on the rear side of the front cover 17. The edge of the front cover 17 is mounted on the front port edge of the cylinder liner 103 on the upper part of the housing 1 by fastening screws. The support sealing ring 18 squeezes and fixes the outer wall of the front end of the sleeve cylinder body 2. At the same time, an inner pressure ring 9 is installed at the rear end of the stroke blind hole 201 of the sleeve cylinder body 2 located in the rear end of the cylinder liner 103 on the upper part of the housing 1. That is, the edge of the inner pressure ring 9 is fixed to the rear end face of the sleeve cylinder body 2 by an inner set screw 10. Further, a bearing seat 11 is installed on the rear end face of the cylinder liner 103. Specifically, the cylinder liner 103 and the bearing seat 11 have the same rectangular outer wall and the same inner diameter central shaft hole. The front end of the central shaft hole of the bearing seat 11 has a reduced diameter structure. The protruding part of the front end of the bearing seat 11 is embedded in the rear port edge of the cylinder liner 103, and the cylinder liner 103 and the bearing seat 11 are connected by corner through bolts. Furthermore, a lead screw 12 is installed in the central shaft hole of the bearing housing 11. The slender lead screw section at the front of the lead screw 12 is screwed forward through the threaded hole in the middle of the inner pressure ring 9 and extends into the stroke blind hole 201 of the sleeve cylinder 2, forming a front lead screw thread support structure. The front and rear sides of the protruding ring of the middle of the lead screw 12 are respectively sleeved with the bearing disc 13 and the outer wall is close to the inner wall of the bearing housing 11, forming a central support. Then, an outer pressure ring 14 is installed on the rear port edge of the bearing housing 11. Specifically, the protruding part in the middle of the front end face of the outer pressure ring 14 is inserted into the rear port edge of the bearing housing 11 and presses the bearing disc 13. The inner wall of the middle hole of the outer pressure ring 14 is clamped to the partial outer wall of the rear section of the lead screw 12, forming a rear support. Furthermore, the edge of the outer pressure ring 14 is fastened to the rear end face of the bearing housing 11 by a cylindrical end screw 15. A pressure cap 16 is installed on the outer sleeve at the middle of the rear end face of the outer pressure ring 14, i.e., the rear end of the lead screw 12.

[0060] As described above, an axially extending outer guide groove 104 is provided on the outer wall of the cylinder liner 103 on the upper part of the housing 1, and correspondingly, an inner guide groove 202 is provided at the corresponding position on the outer wall of the cylinder liner 2. The cylindrical end of the outer set screw 19 extends from the outer guide groove 104 on the upper part of the housing 1 into the inner guide groove 202 on the side of the cylinder liner 2 to lock the cylinder liner 2 and prevent it from rotating. The cylinder liner 103 is inclined backward and upward.

[0061] As described above, a hinge hole 105 is laterally provided in the middle of the support arm 102, which is inclined upward in the middle of the body shell 1. The middle section of the lever 4 is cross-fitted into the hinge hole 105. The middle section of the support arm 102 and the middle section of the lever 4 are hinged through the hinge hole 105 and the shaft pin 7. The rear end of the lever 4 is located on the lower side of the rear section of the cylinder liner 103. A threaded hole is opened at the rear end of the lever 4. The lifting screw 20 is screwed through the threaded hole at the rear end of the lever 4 and abuts against the bottom surface of the rear section of the cylinder liner 103.

[0062] As described above, a first support block 5 is installed on the front end face of the cylinder body 2. The first support block 5 is inserted into the end transverse groove 203 on the front end face of the cylinder body 2 through a straight ridge with a strip-shaped protrusion in the middle of its rear end face. The first support block 5 is fixed to the front end face of the cylinder body 2 by screws through the mounting holes at the corners. A second support block 6 is installed on the front end of the lever 4.

[0063] As described above, a clamping block 8 is installed at the rear end of the shell base plate 101 at the bottom of the shell 1. The bottom of the clamping block 8 protrudes downward and has an inwardly folded inclined surface corresponding to the inner wall of the bottom protrusion at the front end of the shell base plate 101. The clamping block 8 is fastened to the rear end edge of the shell base plate 101 by screws. The clamping block 8, together with the shell 1, secures the shell 1 to the machine tool worktable. Depending on the structure of different machine tool worktables, the structural type and clamping method of the shell 1 can vary.

[0064] In this embodiment of the invention, the outer set screw 19 installed on the housing 1 is loosened, and the rear end of the lead screw shaft 12 is rotated with a wrench. The inner pressure ring 9 drives the cylinder body 2 to move back and forth within the cylinder liner 103 of the housing 1, thereby driving the first support block 5 to move back and forth so that the first support block 5 can contact and support one side surface of the workpiece 3. At the same time, the lifting screw 20 is turned, causing the lever 4 to swing around the shaft pin 7, thereby causing the second support block 6 to move up and down so that it can contact the other partial surface of the workpiece 3 and support the workpiece 3. The supporting working surfaces of the first support block 5 and the second support block 6 form a composite support structure with an included angle of less than 90° and an opening basically facing the direction of the cutting force, which is used to support the workpiece 3 and prevent it from collapsing when subjected to cutting force.

[0065] Preferably, the lifting screw 20 is an M10×45 knurled flat head screw. The inner wall of the cylinder liner 103 of the housing 1 and the outer wall of the cylinder body 2 are fitted with a clearance of 0.01mm to 0.015mm. The inner pressure ring 9, outer pressure ring 14, lead screw shaft 12 and cylinder body 2 are repair parts. The inner pressure ring 9 and outer pressure ring 14 enable the lead screw shaft 12 and the cylinder body 2 to rotate flexibly and move freely without significant axial movement, without obvious obstruction.

[0066] In this embodiment, for clarity, the screw hole is considered to be a countersunk hole with a diameter of 5mm to 10mm and a depth of 7mm to 12mm.

[0067] Based on the embodiments of the present invention described above, although the implementation of the present invention has been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. A mid-section anti-reverse optimization stabilizing support device for machining slender shaft workpieces, comprising a housing (1), a cylinder body (2), a lever (4), a first support block (5), a second support block (6), a bearing seat (11), a lead screw shaft (12), and a bearing disc (13); characterized in that, A bearing seat (11) is installed behind the housing (1) on which the cylinder body (2) is installed. A bearing disc (13) is installed in the bearing seat (11). The lead screw shaft (12) passes through the bearing seat (11) and the cylinder body (2) from back to front. A lever (4) is hinged in the middle of the housing (1) on the lower side of the cylinder body (2). A first support block (5) and a second support block (6) are installed at the front end of the cylinder body (2) and the lever (4), respectively.

2. The mid-section anti-backlash optimized stabilizing support device for machining slender shaft workpieces according to claim 1, characterized in that, The middle and rear section of the cylinder block (2) has a stroke blind hole (201) in the center axis, and the rear end of the stroke blind hole (201) is fitted with an inner pressure ring (9).

3. The mid-section anti-reverse optimization stabilizing support device for machining slender shaft workpieces according to claim 1, characterized in that, An outer pressure ring (14) is installed on the rear port edge of the bearing housing (11). The protruding part of the front end face of the outer pressure ring (14) is inserted into the rear port edge of the bearing housing (11) and pressed against the bearing disc (13). The inner wall of the middle hole of the outer pressure ring (14) is clamped to the partial outer wall of the rear section of the lead screw shaft (12). The edge of the outer pressure ring (14) is fastened to the rear end face of the bearing housing (11) by a cylindrical end screw (15). A pressure cap (16) is installed on the outer sleeve at the middle of the rear end face of the outer pressure ring (14), i.e., the rear end of the lead screw shaft (12) that extends out.

4. The mid-section anti-backlash optimized stabilizing support device for machining slender shaft workpieces according to claim 1, characterized in that, The supporting working surfaces of the first support block (5) and the second support block (6) form an angle of less than 90°, with the opening facing the direction of the cutting force.

5. The mid-section anti-reverse optimization stabilizing support device for machining slender shaft workpieces according to claim 1, characterized in that, The lever (4) has a ring hinge seat protruding downward from the middle of its bottom side, a screw hole at the rear end of the upper part of the lever (4), and a screw hole at the front edge of the upper part of the lever (4).

6. The mid-section anti-backlash optimized stabilizing support device for machining slender shaft workpieces according to claim 1, characterized in that, The cylinder body (2) has a stroke blind hole (201) in the middle and rear section, and an end transverse groove (203) is provided in the middle of the front end face of the cylinder body (2). The cylinder body has an inner guide groove (202) with a straight structure in the axial direction on the outer wall of the cylinder body. The first support block (5) is inserted into the end transverse groove (203) on the front end face of the cylinder body (2) through the straight ridge with a strip-shaped protrusion in the middle of its rear end face.

7. The mid-section anti-reverse optimization stabilizing support device for machining slender shaft workpieces according to claim 1, characterized in that, The shell (1) includes a shell base plate (101), a support arm (102), a cylinder liner (103), and a hinge hole (105); the support arm (102) is installed vertically from front to center on the upper side of the shell base plate (101) which is flat at the bottom, and the hinge hole (105) is provided in the middle of the support arm (102), and the cylinder liner (103) is connected to the upper end of the support arm (102).

8. The mid-section anti-reverse optimization stabilizing support device for machining slender shaft workpieces according to claim 7, characterized in that, The cylinder liner (103) has an axial through hole inside. A support sealing ring (18) is embedded in the annular groove of the inner edge of the middle hole on the rear side of the front cover (17). The edge of the front cover (17) is installed on the front port edge of the cylinder liner (103) on the upper part of the body shell (1) by fastening screws.

9. The mid-section anti-reverse optimization stabilizing support device for machining slender shaft workpieces according to claim 7, characterized in that, An axially extending outer guide groove (104) is provided on the outer wall of the cylinder liner (103).

10. The mid-section anti-reverse optimization stabilizing support device for machining slender shaft workpieces according to claim 7, characterized in that, A screw hole is made at the rear end of the lever (4). Correspondingly, a screw hole is made on the bottom surface of the rear section of the cylinder liner (103). The lifting screw (20) rotates over the screw hole at the rear end of the lever (4) and pushes up the bottom surface of the rear section of the cylinder liner (103).

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